库车前陆冲断带突发构造发育特点

Development characteristics of pop-up structure in Kuqa foreland thrust belt,northern Tarim Basin,China

探讨突发构造发育及成藏特点,为库车地区高效勘探提供依据。基于库车地区塑性地层沉积特征及区域构造发育特征的研究,明确了突发构造与叠瓦状构造具有密切的相关性,是叠瓦状构造进一步发育的结果。古隆起是控制突发构造发育的关键因素,当古隆起距推覆源位置较近时,在古隆起前缘发育破碎型突发构造;古隆起距推覆源较远时发育完整型突发构造。突发构造具有受盐体包裹、侧向封堵能力强、构造完整性好、裂缝发育程度高、对储层改造作用好的优势,其裂缝发育程度与构造发育程度正相关。突发构造为区域内最为有利的圈闭类型之一,是下一步勘探的首选类型。

This paper investigates the development and the oil accumulation characteristics of a pop-up structure to provide the basis for the efficient exploration in the Kuqa area. Based on the plastic sedimentary characteristics and tectonic characteristics, the authors recognize that there is a close correlation between the pop-up structure and the imbricate structure. The pop-up structure is the result that the imbricate structure further grows. The palaeouplift is the key factor to control the development of the pop-up structure. When there is a short distance from the palaeouplift to mountains, the pop-up structure is broken in the front of palaeouplift. Conversely, when there is a long distance from the palaeouplift to mountains, the pop-up structure develops perfectly. The pop-up structure has the following advantages, that is, a good seal ability, good structural integrity, a high degree of fracture development, and a good reservoir reconstruction. The pop-up structure is one of the most favorable trap types in the area, and it is the preferred type of next exploration.